Facile Synthesis of 3‐Hydroxyglutamic Acids via Cyanation of Chiral <i>N</i>‐Acyliminium Cation Derived From (<i>S</i>)‐Malic Acid
作者:Makoto Oba、Atsushi Mita、Yoshinori Kondo、Kozaburo Nishiyama
DOI:10.1080/00397910500278446
日期:2005.12
(S)‐malic acid is described. The chiral cyclic imide derived from (S)‐malic acid was converted to an acetoxylactam by reduction with sodium borohydride followed by acetylation. The obtained acetoxylactam was treated with trimethylsilyl cyanide in the presence of boron trifluoride etherate to give the corresponding cyanolactam in high yield, even though the diastereoselectivity of the cyanation reaction was
摘要描述了通过氰化衍生自 (S)-苹果酸的 N-acyliminium 中间体轻松合成 3-羟基谷氨酸。衍生自(S)-苹果酸的手性环状酰亚胺通过用硼氢化钠还原然后乙酰化转化为乙酰氧基内酰胺。所得乙酰氧基内酰胺在三氟化硼醚合物存在下用三甲基甲硅烷基氰化物处理以高产率得到相应的氰内酰胺,即使氰化反应的非对映选择性适中。氰内酰胺的非对映异构体可通过色谱分离并独立转化为 (2R,3S)- 和 (2S,3S)-3-羟基谷氨酸。